Best BLACK+DECKER Weed Wacker with Auto Feed (BESTA510)

Q: Does the BESTA510 have automatic line feed?

Yes. The listing says automatic feed spool technology eliminates bumping for hassle-free line feeding, and the BLACK+DECKER page describes the same automatic feed spool. The Virginia Tech guide warns that automatic-feed trimmers may release more string than needed, so check the string length often.

Q: Is the BESTA510 cordless?

No. The listing gives the power source as Corded Electric, and the BLACK+DECKER page says Corded with 120 V and Battery Included: No. If you need to work away from an outlet, look at a cordless model instead. The Virginia Tech guide adds that electric trimmers are generally less powerful and less robust than gasoline-powered trimmers.

Q: Is it safe to use near people and pets?

Take care. The Virginia Tech guide says string trimmers are known to throw stones, sticks, and other objects at high speeds, and advises wearing eye and ear protection when operating power tools. It also says to make sure there are no bystanders, children, or pets within a 50-foot radius. Keep the guard fitted, and do not trim in wet conditions.

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Shoppers who type best black+decker weed wacker with auto feed want to know one thing first: does this corded 14-inch trimmer and edger do the job with automatic line feed, and is the feature worth the cord? The BLACK+DECKER BESTA510 is a 6.5-amp corded electric unit. Its Amazon listing and the BLACK+DECKER product page both describe automatic feed spool technology and a corded design. The BLACK+DECKER page lists run time as unlimited because the tool is corded, and the listing gives no run time. The two pages also list the weight and width differently, and this post shows both figures.

Quick answer

It is a corded, 6.5-amp, 2-in-1 string trimmer and edger with a 14-inch cut path, automatic feed spool technology, and a wheeled edge guide, according to the listing and BLACK+DECKER.
Automatic feed is the headline feature. The Virginia Tech extension guide warns that automatic-feed trimmers “may release more string than needed,” so check the line length regularly.
The cord sets your reach. The same guide says the cord length “limits the area that can be covered.”
Both sources describe a 2 Year Limited Warranty. Skip the BESTA510 if you need cordless freedom or a heavier machine.

The product at a glance

The table lists what the Amazon listing states (from our stored scan dated 2026-10-12) and what the BLACK+DECKER product page states (opened 2026-10-22). A cell that says “not stated” means that source is silent on the point.

Feature	Amazon listing (stored 2026-10-12)	BLACK+DECKER page (opened 2026-10-22)
Model	BESTA510	BESTA510
Power	Corded Electric	Corded
Voltage	Not stated	120 V
Motor	6.5-amp	6.5 Amp
Cut path	14 in.	14 in.
Speed	8000 rpm	Not stated
Feed	Automatic feed spool technology	Automatic feed spool (AFS) technology
Edger	2-in-1 trimmer and edger with wheeled edge guide	2in1 trimmer and edger with wheeled edge guide
Battery included	Not stated	No
Run time	Not stated	Unlimited (corded)
Weight	6.3 pounds	6.5 lb
Dimensions	8.5 in long, 4.88 in wide	8.5 in long, 5.0 in wide, 36.9 in high
Color	Orange, black	Not stated
Included	String trimmer, AF-100 spool, auxiliary handle, guard	String trimmer, AF-100 spool, auxiliary handle, guard
Warranty	2 Year Limited Warranty (the listing also names a 30 Day Money Back Guarantee)	2 Year Limited Warranty

The full Amazon listing for this model is here: View on Amazon

Who it suits

This trimmer suits a homeowner whose lawn edges, fence lines and flower bed borders sit within comfortable reach of one outdoor outlet. The Virginia Tech guide says that “Electric trimmers are relatively light and easy to maneuver and operate.” For a yard where the cord can reach the work, that lightness is the point of choosing electric over gas. BLACK+DECKER adds that “The 6.5 amp motor and POWERDRIVE Transmission provide maximum performance when trimming through the toughest weeds, grass, and overgrowth.” That is the manufacturer’s statement for the motor, and the sections below explain what the sources leave open.

It also suits a reader who wants one head that trims and edges. The listing says the trimmer converts to a wheeled edger: “2 in1 Trimmer Edger with wheeled edge guide – just rotate to convert from trimmer to wheeled edger.” BLACK+DECKER describes the same feature as a wheeled edge guide that puts “the finishing touches on the edges of your lawn around driveways, sidewalks, and flower beds.” A reader who edges once a month along a walk gets one tool for both jobs.

A third group is the owner who hates stopping to feed line. The manufacturer says “Automatic Feed Spool technology eliminates bumping for more string,” which means the line advances without tapping the head on the ground. That claim comes from BLACK+DECKER, and it is the feature the keyword is looking for. The trimmer is a fit for a reader who wants the feature and accepts the cord.

Readers who want the 2-in-1 format and cordless power should compare the cordless route before buying this one. For a battery-powered weed eater from the same brand family, see the Black and Decker Cordless Weed Eater 20v post. The choice is between freedom from a cord and a corded machine’s steady power.

Skip it if

Skip this trimmer if your work area is far from an outlet. Both sources describe the BESTA510 as corded, and the Virginia Tech guide is direct about the trade-off: “However, they lack flexibility, and the length of the power cord limits the area that can be covered.” A long lawn with no nearby outlet is a poor match. If a cord is the workaround, the Best Extension Cord for Electric Lawn Mower post is the place to start for cord choices, but the cord length for this trimmer is still not in the listing.

Skip it if you want a machine for heavy, tough growth. The Virginia Tech guide says electric trimmers are “generally less powerful and less robust than gasoline-powered trimmers.” BLACK+DECKER says the trimmer takes on “tough weeds, grass, and overgrowth,” but that is the manufacturer’s statement, and no independent source in this post confirms it.

Skip it if you plan to trust the auto feed without checking. The Virginia Tech guide says: “Automatic-feed and bump-feed trimmers may release more string than needed. This increases the chances of striking the operator.” The guide’s advice is to “Check the trimmer string length periodically.” Build that check into every use.

Skip it if you would run it without the guard. The same guide says: “Do not remove protective guards and string guides.” The BESTA510 kit includes a guard, so keep it fitted for every job, including edging with the wheel.

Skip it if you work in wet grass. The guide says: “Do not operate electric trimmers in wet conditions.” The rule covers a lawn that is wet from rain, and it matters more with a corded tool.

What the listing does not say

The two pages agree on the core facts, but they leave a few questions open, and they disagree on two measurements. These are the points a buyer should close before ordering.

Weight: the listing gives 6.3 pounds, and the BLACK+DECKER page gives 6.5 lb. We show both and do not pick one.
Width: the listing gives 4.88 inches, and the BLACK+DECKER page gives 5.0 inches. The length of 8.5 inches agrees on both.
Height: only the BLACK+DECKER page gives a height, 36.9 inches. The listing does not.
Cord length: neither source states the length of the power cord, which is the single figure that sets your reach.
Line size: the listing does not state the line size. The Virginia Tech guide says the lines on electric trimmers “are limited to 2.5 mm (0.10 inch),” which is a general rule for electric trimmers, not a statement about this model.
Speed: the listing gives 8000 rpm. The BLACK+DECKER page does not give a speed.
Warranty: both sources give a 2 Year Limited Warranty. The listing also names a 30 Day Money Back Guarantee, which is a seller term and not a product warranty. Neither source explains what the warranty covers.

The package contents are the same on both pages: a string trimmer, an AF-100 spool, an auxiliary handle and a guard. Neither page says how many spare spools come in the box or how long one spool of line lasts.

How we chose

This post covers one product: the BLACK+DECKER BESTA510 2-in-1 string trimmer and edger, ASIN B077Z78YQX. The listing data comes from our stored product scan dated 2026-10-12, and we did not re-read the Amazon page for this post. We used the stored bullets and specification fields and recorded no prices, ratings, badges or images.

The criteria were narrow. We looked for a manufacturer page for the exact model number, because the keyword names a feature and the model is the only way to check it. The BLACK+DECKER product page for BESTA510 was the one that matched. We also looked for at least one university extension source on electric trimmer safety and use. The Virginia Tech guide covers electric string trimmers and the risks of automatic-feed heads, so it answers the questions this keyword raises.

We did not rank this trimmer against other trimmers, and we did not compare any price. The post makes no claim that the BESTA510 is the best auto-feed trimmer. We used retail pages for nothing except the stored listing fields, and we used no blog or review page for any fact.

The dates matter. The listing data is from 2026-10-12. The manufacturer page and the extension guide were opened on 2026-10-22. If the listing has changed since the scan, the weight, width and warranty figures may have changed too.

What we could not verify

Cutting performance: the manufacturer says the trimmer takes on tough weeds, grass and overgrowth, and that the 6.5-amp motor and transmission give maximum performance. No independent source we opened reports how it performs on those jobs, so we make no claim.
Auto feed reliability: BLACK+DECKER says the feed “eliminates bumping.” We did not find an independent statement on how often the feed works without help, or how often it needs attention.
Which weight is correct: the listing says 6.3 pounds and the manufacturer page says 6.5 lb. We could not resolve the gap.
Which width is correct: the listing says 4.88 inches and the manufacturer page says 5.0 inches.
Cord length and cord type: neither source states them.
Spool and line compatibility: the kit includes an AF-100 spool. The sources do not say which replacement spools and line sizes fit the BESTA510 beyond that.
Cord retention in use: both sources describe a cord retention system. They do not say how well it holds up over repeated use.

FAQ

Does the BESTA510 have automatic line feed?

Yes. The listing says “Automatic feed spool technology which eliminates bumping for hassle-free line feeding,” and the BLACK+DECKER page describes the same automatic feed spool. The Virginia Tech guide adds a caution: automatic-feed trimmers “may release more string than needed,” so check the string length often.

Is the BESTA510 cordless?

No. The listing gives the power source as “Corded Electric,” and the BLACK+DECKER page says “Corded” with 120 V and “Battery Included: No.” If you need to work away from an outlet, look at a cordless model instead. The Virginia Tech guide adds that electric trimmers are “generally less powerful and less robust than gasoline-powered trimmers.”

Can I use it to edge as well as trim?

Yes, according to both sources. The listing says the trimmer converts to a wheeled edger by rotating the edge guide, and BLACK+DECKER describes the edging wheel for driveways, sidewalks and flower beds. The conversion uses a wheel, not a blade, so the blade-based edger warnings in the extension guides do not describe this tool.

What warranty does it carry?

Both sources give a 2 Year Limited Warranty. The Amazon listing also names a 30 Day Money Back Guarantee, which is a seller term rather than a product warranty. Neither source explains what the limited warranty covers, so ask the seller or the manufacturer for the terms in writing.

Is it safe to use near people and pets?

Take care. The Virginia Tech guide says: “String trimmers are known to throw stones, sticks, and other objects at high speeds.” It also advises that you “Wear eye and ear protection equipment when operating power tools.” The same guide says: “Make sure there are no bystanders, children, or pets within a 50-foot radius.” Keep the guard fitted, and do not trim in wet conditions.

Do the weight and width figures agree?

No. The listing gives 6.3 pounds and 4.88 inches wide. The BLACK+DECKER page gives 6.5 lb and 5.0 inches wide. Both list 8.5 inches in length. Use the manufacturer figures if you need the most conservative numbers, and confirm them against the box before you buy.

Bottom line

Buy the BESTA510 if your edges and borders stay within comfortable reach of an outlet and you want automatic line feed on a corded trimmer. If you need to work away from an outlet, or you need a machine for heavy growth, choose a different tool.

Sources

BLACK+DECKER Weed Wacker with Auto Feed, 14-Inch 2 in 1 String Trimmer Lawn Edger, BESTA510, Amazon listing (stored scan 2026-10-12)
https://www.amazon.com/dp/B077Z78YQX
2 in 1 String Trimmer/Edger Weed Wacker, 6.5-Amp, 14-Inch Auto Feed, BLACK+DECKER (opened 2026-10-22)
https://www.blackanddecker.com/products/besta510
BSE-50, Virginia Tech Extension, lawn care power tool safety (opened 2026-10-22)
https://pubs.ext.vt.edu/BSE/BSE-50/BSE-50.html